hitachi -...

TECHNICAL DATAAND

SERVICE MANUAL

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST Nos. WH 12DAF2: G836

WR 12DAF2: G837

August 2005

W

MODELS

WH 12DAF2WR 12DAF2

Hitachi �Power Tools

CORDLESS IMPACT DRIVERWH 12DAF2

CORDLESS IMPACT WRENCHWR 12DAF2

WH 12DAF2 WR 12DAF2

REMARK:

Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s)

is(are) used in the place of company name(s) and model name(s) of our

competitor(s). The symbol(s) utilized here is(are) as follows:

Symbol UtilizedCompetitor

Company Name Model Name

WH 12DAF2

Symbol UtilizedCompetitor

Company Name Model Name

WR 12DAF2

P1 DeWALT DW053

P DeWALT DW052

Page

CONTENTS

1. PRODUCT NAME ............................................................................................................................ 1

2. MARKETING OBJECTIVE .............................................................................................................. 1

3. APPLICATIONS ............................................................................................................................... 1

4. STANDARD EQUIPMENT ............................................................................................................... 1

5. SELLING POINTS ........................................................................................................................... 2

5-1. Selling Point Descriptions ................................................................................................................ 4

6. SPECIFICATIONS ........................................................................................................................... 6

6-1. Specifications ....................................................................................................................................6

6-2. Optional Accessories ........................................................................................................................7

7. COMPARISONS WITH SIMILAR PRODUCTS .............................................................................. 11

7-1. Specification Comparisons ............................................................................................................. 11

7-2. Tightening Torque ...........................................................................................................................13

7-3. Number of Screws or Bolts Driven ..................................................................................................15

8. PRECAUTIONS IN SALES PROMOTION .................................................................................... 16

8-1. Safety Instructions ..........................................................................................................................16

8-2. Tightening Torque Inspection Prior to Operation ............................................................................18

8-3. Tightening Torque Variation ............................................................................................................18

8-4. Suggestions and Precautions for the Efficient Use of the Charger .................................................20

9. OTHER PRECAUTIONS ............................................................................................................... 20

10. REPAIR GUIDE ........................................................................................................................... 21

10-1. Precautions in Disassembly and Reassembly ..............................................................................21

10-2. Precautions in Disassembly and Reassembly of Battery Charger ...............................................27

11. STANDARD REPAIR TIME (UNIT) SCHEDULES....................................................................... 28

For Model WH 12DAF2 ..........................................................................................................................28

For Model WR 12DAF2 ..........................................................................................................................29

Assembly Diagram for WH 12DAF2

Assembly Diagram for WR 12DAF2

READ ME

Click the subject you want. The screen turns to the corresponding page.

--- 1 ---

1. PRODUCT NAME

Hitachi Cordless Impact Driver, Model WH 12DAF2

Hitachi Cordless Impact Wrench, Model WR 12DAF2

2. MARKETING OBJECTIVE

The new Models WH 12DAF2 and WR 12DAF2 are the upgraded versions of the well-reputed Models WH 12DAF

and WR 12DAF. They incorporate many features including the following with the comparable price.

Increased maximum tightening torque

Increased battery capacity (standard accessory)

Convenient belt hook with LED job light

Bit holder

Powerful new design

With the introduction of the new Models WH 12DAF2 and WR 12DAF2, we aim to increase our market share and

sales.

3. APPLICATIONS

Tightening/loosening of small screws, tapping screws, wood screws, bolts, nuts, etc.

Drilling into wood and various other materials (with use of optional accessory drill chuck adapter).

[Applicable Markets]

Wood-product assembly: Tightening/loosening of wood screws

Construction industry: Assembly of scaffolding, roofing, aluminum sashes, fencing, etc.; removal of plastic cones

from concrete forms, mounting/removal of form ties; drilling into the wood frames of concrete forms, etc.

Manufacturing industry: Assembly work for automobiles, rolling stock, shipbuilding, agricultural machinery and

tools, industrial machines, steel furniture, etc.

Utility industry: Assembly and installation of electric equipment, plumbing facilities, air conditioning (duct

assembly, etc.), sanitary fixtures and various other facilities

Service industry: General repair work; installation of advertising aids, automobile repair, assembly of garages

and carports storage sheds, etc.

Various other assembly, construction or repair facilities

4. STANDARD EQUIPMENT

(1) NN specification: Without battery, charger and case (only main body)

(2) 2SGK specification: Two EB 1214S batteries (NiCd, capacity 1.4 Ah), UC 18YG charger and case

(3) SGK specification: One EB 1214S battery (NiCd, capacity 1.4 Ah), UC 18YG charger and case

(4) 2SGKX specification: Two EB 1214S batteries (NiCd, capacity 1.4 Ah), UC 18YG charger, case and UB 12D

torchlight

(5) 2BLGK specification: Two EB 1220BL batteries (NiCd, capacity 2.0 Ah), UC 18YG charger and case

(6) 2HLFK specification: Two EB 1226HL batteries (NiMH, capacity 2.6 Ah), UC 14YFA charger and case

4

--- 2 ---

5. SELLING POINTS

(1) Cordless impact driver Model WH 12DAF2

Soft-grip handleVariable speed reversibleswitch with electric brake

Durable die-casting aluminum hammer case

Powerful new design

Convenient belt hookwith LED job light

Bit holder

Fast tightening speed 30% faster than the Model WH 12DAF

Max. torque 110 N�m (975 in-lbs.) WH 12DAF: 88 N�m (780 in-lbs.)

--- 3 ---

(2) Cordless impact wrench Model WR 12DAF2

Soft-grip handle

Variable speed reversibleswitch with electric brake

Durable die-casting aluminum hammer case

Powerful new design

Convenient belt hookwith LED job light

Max. torque 130 N�m (1150 in-lbs.) WR 12DAF: 110 N�m (975 in-lbs.)

--- 4 ---

5-1. Selling Point Descriptions

Common selling points (Models WH 12DAF2 and WR 12DAF2)

(1) Soft-grip handle

The grip is soft, slip-resistant and comfortable thanks to the soft resin (elastomer) covered on the handle.

(2) Convenient belt hook with LED job light

It can be used as a hook for suspending from a waist belt or storing. Its yellow LED light is very convenient for

such operations as tightening screws in a dark place. This hook features the following:

It can be slid out when necessary and slid in when not necessary with one-touch simple operation. The

angle can be adjusted in 5 steps.

It can be installed on either right or left side. It is easily replaceable with a flat-blade screwdriver or a coin.

The yellow LED light can be lit by turning on its switch when necessary. The lighting direction is diagonal to

minimize shadowing over the tool tip and the operator's hand holding a screw. The light will turn off

automatically after 15 minutes if forgotten.

Selling points of the Model WH 12DAF2

(1) Fast tightening speed thanks to the powerful tightening torque (30% faster than the conventional model when

tightening a universal machine screw of 5.3 mm diameter and 120 mm length)

The maximum tightening torque and the tightening speed of the Model WH 12DAF2 are greatly increased in

comparison with the Model WH 12DAF thanks to the increased output of the motor and the large hammer.

Tightening time comparison

Figure 1 shows the time required for tightening a wood screw (5.3 mm dia. x 120 mm length) into a lauan

workpiece.

1

* Tightening time may vary depending on hardness of the workpiece, ambient temperature, characteristics

of the battery, etc.

Fig. 1 Tightening time comparison

WH 12DAF2

WH 12DAF

4.8 sec.

Model(sec.)

6.5 sec.

4.7 sec.

6 128 1442 10

Fast Slow

P

16

--- 5 ---

Fig. 3

Selling points of the Model WR 12DAF2

(1) Max. torque 130 N�m (1150 in-lbs.)

The maximum torque is 130 N�m (1150 in-lbs.) thanks to the optimum striking design while maintaining high

mechanical strength with the durable die-casting aluminum hammer case etc.

(2) Tightening torque comparison

Figure 3 shows the torque required for tightening an M12 high-strength bolt in 3 seconds with a hexagon

socket (overall length 33 mm) (20 % higher than the Model WR 12DAF).

*1: Max. tightening torque is based on tighting an M16 F10T bolt in 3 seconds with a hexagon socket (40 mm long).

* The data above are intended for reference purposes only because actual tightening torque will vary depending on tightening conditions.

Tigh

teni

ng to

rque

0

80

60

40

20

100

120

140

WR 12DAF P1*1

kgf cm

113

164

134

WR 12DAF2

160

180

200

0

1800 (1562 in-lbs.)

2000 (1736 in-lbs.)N m

400 (347 in-lbs.)

800 (694 in-lbs.)

1200 (1042 in-lbs.)

1600 (1389 in-lbs.)

200 (174 in-lbs.)

1000 (868 in-lbs.)

600 (521 in-lbs.)

1400 (1215 in-lbs.)

(2) Max. torque 110 N�m (975 in-lbs.)

The maximum torque is 110 N�m (975 in-lbs.) thanks to the optimum striking design while maintaining high

mechanical strength with the durable die-casting aluminum hammer case, etc.

Tightening torque comparison

Figure 2 shows the torque required for

tightening an M12 high-strength tension

bolt in 3 seconds with a hexagon socket

(overall length 33 mm) (25% higher than

the Model WH 12DAF).

Fig. 2 Tightening torque comparison

113

40

80

160

0WH 12DAFWH 12DAF2

400 (347 in-lbs.)

800 (694 in-lbs.)

1200 (1042 in-lbs.)

N m

120

1600 (1389 in-lbs.)

90

116140

100

60

200 (174 in-lbs.)

1000 (868 in-lbs.)

600 (521 in-lbs.)

1400 (1215 in-lbs.)

kgf cm

20

P *1

Tig

hte

nin

g torq

ue

1

*1: Max. tightening torque is based on tighting an M14 high-strength tension bolt in 3 seconds with a hexagon socket (40 mm long).

(3) Bit holder

A bit holder is provided at the handle portion. It is very convenient for holding a spare bit.

--- 6 ---

6. SPECIFICATIONS

6-1. Specifications

Capacity Small screw M4 --- M8 (5/32" --- 5/16")*1

Ordinary bolt M5 --- M12 (3/16" --- 15/32")High-strength bolt M5 --- M10 (3/16" --- 25/64")

Tightening torque*2 110 N�m (1120 kgf �cm, 975 in-lbs.)

Tip condition 6.35 mm (1/4") bit holder

Type of motor Fan cooled DC magnet motor

Enclosure Main body: Glassfiber reinforced polyamide resin (black)and thermoplastic elastomer (green)Aluminum alloy die casting � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Hammer case

Storage battery: ABS resin (black)Charger: ABS resin (black)

Type of switch Trigger switch with forward/reverse changeover pushing button (with brake)

Handle configuration T-type

No-load rotational speed 0 --- 2,500/min

Impact rate 0 --- 2,900/min

Main body 1.6 kg (3.5 lbs.) (with battery EB 1214S)1.7 kg (3.7 lbs.) (with battery EB 1220BL/EB 1226HL)

Battery 0.5 kg (1.1 lbs.) (EB 1214S)0.6 kg (1.3 lbs.) (EB 1220BL/EB 1226HL)

Overall length x height 181 mm (7-1/8") x 217 mm (8-35/64")(with battery EB 1214S)182 mm (7-11/64") x 226 mm (8-29/32")(with battery EB 1220BL/EB 1226HL)

Center height 26.5 mm (1-3/64")

Battery(Type EB 1214S/

EB 1220BL)

Sealed cylindrical nickel-cadmium batteryNominal voltage � � � � � � � � DC 12 VNominal life � � � � � � � � � � � � � � Charging/discharging: approximately 300 cycles

(in the case of the Model UC 14YFA or UC 18YG)Nominal capacity � � � � � � � 1.4 Ah/2.0 Ah

Weight

� � � � � � Housing

Battery(Type EB 1226HL)

Sealed cylindrical nickel-metal hydride batteriesNominal voltage � � � � � � � � DC 12 VNominal life � � � � � � � � � � � � � � Charging/discharging: approximately 500 cycles

(in the case of the Model UC 14YFA)Nominal capacity � � � � � � � 2.6 Ah

ItemModel Cordless Impact Driver

WH 12DAF2Cordless Impact Wrench

WR 12DAF2

Ordinary bolt M6 --- M14 (1/4" --- 9/16")High-strength bolt M6 --- M10 (1/4" --- 25/64")

130 N�m (1330 kgf �cm, 1150 in-lbs.)

12.7 mm (1/2") square drive

176 mm (6-15/16") x 217 mm (8-35/64")(with battery EB 1214S)176 mm (6-15/16") x 226 mm (8-29/32")(with battery EB 1220BL/EB 1226HL)

Charger power source: Single-phase AC, 50/60 HzVoltage: Depending on the order specificationPower input: 56 WCharging system: Constant current charge with feedback controlOvercharge protection system: (1) Battery voltage detection ( 2V system) Battery temperature detection (dT/dt system) for Ni-MH battery (2) Battery surface temperature detection (thermistor) (3) 120-minute timerOutput voltage: 7.2 V --- 14.4 VOutput current: 2.6 A

Charger(Model UC 14YFA)

--- 7 ---

*1: In the case of tapping screws and wood screws, a minimum of M3 (1/8") is possible.*2: This torque is based on tightening an M12 (15/32") bolt (strength grade: 12.9) for 3 seconds with a hexagonal socket.

Charging time: Approx. 30 minutes (for type EB 1214S battery at 20ûC) Approx. 60 minutes (for type EB 1226HL battery at 20ûC)

Approx. 50 minutes (for type EB 1220BL battery at 20ûC)Power weight: 0.6 kgOperable ambient temperature range: 0ûC ---

40ûCThe maximum allowable temperature of the EB 1214S or EB 1220BL type battery is55ûC and the EB 1226HL type battery is 45ûC.

Charger(Model UC 14YFA)

Overcharge prevention circuit:A thermostat monitors the surface temperature of the battery and, on detecting thetemperature rise which occurs on completion of charging, automatically turns off theunit to prevent the battery from overcharge.Output capacity: 70 WIndication method: Pilot lamp indicator of battery chargingFunction: On.............................................................................. During charging Off ............................................................................. Charging completed

Charger(Model UC 18YG)NOTE: The Model UC 18YG

charger is exclusive to

NiCad batteries.

Prior to charging

During charging

Charging completed

Charging notpossible

High batterytemperature

Blinks

Lit

Blinks

Flickers

Lit

0.5 sec ON, 0.5 sec OFF

Stays ON constantly



Stays ON constantly

Pilot lamp indications (Model UC 14YFA)

Red pilot lampremains lit or flashes

Green pilot lamp is lit

Storage battery or chargeris faulty.

Charging not possiblebecause storage batterytemperature is too high.

6-2. Optional Accessories

(1) Battery (EB 1214S, EB 1220BL, EB 1226HL)

(2) For the Model WH 12DAF2

There are two types of attachment sizes for the driver bit and the socket. Please refer to the table below and

select the attachment size for the driver bit or socket that is appropriate for your WH 12DAF2.

--- 8 ---

996177 8 (5/16")65 (2-9/16") 8

Stamped figures

5 mm Hexagon socket

Part NameL

(mm)B

(mm)Code No.

98532910 (3/8")65 (2-9/16")106 mm Hexagon socket

99617812 (15/32")65 (2-9/16")125/16" Hexagon socket


99618014 (9/16")65 (2-9/16")1410 mm Hexagon socket (small type)



99619721 (53/64")166 (6-17/32")211/2" Hexagon long socket

Woodworking drill bit (Code No. 959183)

14 m

m d

ia.

(35/

64")

83 mm (3-17/64")

992689 7 (1/4")65 (2-9/16") 74 mm Hexagon socket

Drill chuck adaptor set (Code No. 321823)

The drill chuck adaptor set permits mounting of various types

of locally-available drill bits for a variety of drilling operations.

Plus driver bit

Hexagon socket

Stamped figures

Bit No.

No. 2

No. 3

Code No.

992671

99267250 mm (2")

--- 9 ---

10 (3/8")

12 (15/32")

13 (1/2")

14 (9/16")

17 (21/32")

19 (23/32")

21(53/64")

22 (7/8")

M 6 (1/4")

M 8 (5/16")

M 10 (3/8")

M 12 (15/32")

M 14 (9/16")

M 8 (5/16")

M 10 (3/8")

M 12 (15/32")

M 14 (9/16")

M 16 (5/8")

(3) For the Model WR 12DAF2

The Model WR 12DAF2 is a 12.7 square driver specification. Please select the socket with the appropriate

attachment size.

Each dimension and applicable bolt for each hexagon socket

10 mm

12 mm

13 mm

14 mm

17 mm

19 mm

21 mm

22 mm

40 (1-9/16")

40 (1-9/16")

40 (1-9/16")

40 (1-9/16")

32 (1-1/4")

34 (1-11/32")

36 (1-13/32")

40 (1-9/16")

B

B

B

B

C

C

D

D

W 5/16"

W 3/8"

W 7/16"

W 1/2"

M 12 (15/32")

944291

873632

873539

873540

873536

873624

873626

873627

Hex

agon

soc

ket

12.7 mm(1/2")

Squaredrive

dimensionSq

Partname

CodeNo.

Nominal diameter of applicable bolts Dihedralwidth

H (mm) Sha

pe Socket primary dimensions (mm)

L L1

8 (5/16")

8 (5/16")

9 (11/32")

9 (11/32")

8 (5/16")

9 (11/32")

10 (3/8")

14 (9/16")

D1

18 (23/32")

20 (25/32")

25 (1")

25 (1")

28 (1-3/32")

28 (1-3/32")

32 (1-1/4")

35 (1-3/8")

ISO(Ordinary)

ISO(Small type)

Inchscrew

ISO(High-

strength)

�Each dimension and applicable bolt for each long socket

Shape B Shape C Shape D

Shape B Shape D

--- 10 ---

12 mm

13 mm

14 mm

17 mm

17 mm

19 mm

19 mm

21 mm

21 mm

21 mm

22 mm

34 (1-11/32")

34 (1-11/32")

34 (1-11/32")

34 (1-11/32")

57 (2-1/4")

34 (1-11/32")

57 (2-1/4")

34 (1-11/32")

57 (2-1/4")

107 (4-7/32")

34 (1-11/32")

52 (2-3/64")

52 (2-3/64")

52 (2-3/64")

52 (2-3/64")

75 (2-15/16")

52 (2-3/64")

75 (2-15/16")

52 (2-3/64")

75 (2-15/16")

125 (4-47/51")

52 (2-3/64")

B

B

B

B

B

B

B

D

D

D

D

12 (15/32")

13 (1/2")

14 (9/16")

17 (21/32")

17 (21/32")

19 (23/32")

19 (23/32")

21 (53/64")

21 (53/64")

21 (53/64")

22 (7/8")

W 5/16"

W 3/8"

W 3/8"

W 7/16"

W 7/16"

W 1/2"

W 1/2"

W 1/2"

M 12 (15/32")

955138

955139

955140

955141

955149

955142

955150

955143

955151

991480

955144

Long

soc

ket

12.7 mm

(1/2")

Squaredrive

dimensionSq

Partname

CodeNo.

Nominal diameter of applicable bolts Dihedralwidth

H (mm) Sha

pe Socket primary dimensions (mm)

L L1

20 (25/32")

20 (25/32")

20 (25/32")

24 (15/16")

24 (15/16")

24 (15/16")

24 (15/16")

24 (15/16")

24 (15/16")

24 (15/16")

24 (15/16")

D1

20 (25/32")

21.5 (53/64")

22 (7/8")

25 (1")

25 (1")

28 (1-3/32")

28 (1-3/32")

31 (1-7/32")

31 (1-7/32")

31 (1-7/32")

32.5 (1-9/32")

L2

ISO(Ordinary)

ISO(Small type)

Inchscrew

ISO(High-

strength)

M 8 (5/16")

M 10 (3/8")

M 10 (3/8")

M 12 (15/32")

M 12 (15/32")

M 14 (9/16")

M 8 (5/16")

M 10 (3/8")

M 12 (15/32")

M 12 (15/32")

M 14 (9/16")

M 14 (9/16")

M 16 (5/8")

�Bit adaptor (Code No. 991476)

6.35 mm (1/4") 45 mm (1-25/32")

13.5

mm

dia

.(1

7/32

")

12.7 mm (1/2")

� Extension bar [Overall length 100 mm (3-15/16") ] (Code No. 873633)

� Universal joint (Code No. 992610)

� Socket ass'y for duct

Part name Overall length(mm) Code No.

Plus hd.driver bitNo. 2

45 (1-25/32") 955229

70 (2-3/4") 955654

45 (1-25/32") 955230

70 (2-3/4") 955655

Plus hd.driver bitNo. 3

Dihedral width ofapplicable bolts Code No.

12 (15/32") 993658

13 (1/2") 992613

14 (9/16") 992615

� EW-14R corner attachment (Code No. 9329-9001)

--- 11 ---

EB 1220BL � � � � � � Approx. 50 min.

7. COMPARISONS WITH SIMILAR PRODUCTS

7-1. Specification Comparisons

7-1-1. Cordless impact driver

M4 --- M8 (5/32" --- 5/16")

HITACHI

WH 12DAF2

MakerModelItem

Capacity

Small screw

M5 --- M12 (3/16" --- 15/32")Ordinary bolt

M5 --- M10 (3/16" --- 3/8")High-strength bolt

110(975 in-lbs., 1120 kgf�cm)

Max. tightening torque N�m

0 --- 2,500No-load rotation speed /min

0 --- 2,900Impact rate /min

Main body weight kg

Overall length mm 176 (6-15/16")

Center height mm

Equipped

Driver chuckTool tip mounting system

Switch

DC magnetType of motor

12Voltage

1.4/2.0/2.6

12

Bat

tery

V

TypeEB 1214S/EB1220BL/

EB 1226HL

Nominal capacity Ah

UC 14YFA/UC 18YG

Nominal voltage V

EB 1226HL � � � � � � Approx. 60/- min.

Model

min.

7.2 --- 14.4/7.2 --- 18Recharging voltage V

Plastic case Charger (UC 14YFA/UC 18YG)

Standard accessories

Cha

rger

*2

*3

Overall height mm

26.5 (1-3/64")

1.7 (3.7 lbs.): With EB 1220BL/ EB 1226HL

1.6 (3.5 lbs.): With EB 1214S

226 (8-7/8"): With EB 1220BL/ EB 1226HL

217 (8-1/2"): With EB 1214S

Variable speed

Electric brake Equipped

Charging time EB 1214S � � � � � � Approx. 30 min.

*1

*1: In the case of tapping screws and wood screws, a minimum of M3 is possible.*2: Max. tightening torque is based on tightening an M12 (15/32") bolt (strength grade: 12.9) for 3 sec. with a hexagon socket.*3: Main body weight does not include accessory tools (hexagon bit etc.).*4: This type of battery could not be charged by the Model UC 18YG.*5: This type of battery could not be charged by the Model UC 12SD.

M4 --- M8 (5/32" --- 5/16")

M4 --- M12 (5/32" --- 15/32")

M4 --- M10 (5/32" --- 3/8")

88(780 in-lbs., 900 kgf�cm)

0 --- 2,200

0 --- 2,900

176 (6-15/16")

Equipped

Driver chuck

DC magnet

12

1.2/1.4/2.0/2.2

12

EB 1212S/EB 1214L/

EB 1220BL/EB 1222HL

UC 12SD/UC 24YFA

EB 1212S, EB 1214L � � � � � Approx. 60/40 min.

12/7.2 --- 24

Plastic case Charger (UC 12SD/UC 24YFA)

26 (1-1/64")

1.6 (3.5 lbs.): With EB 1214L/ EB 1220BL/ EB 1222HL

226 (8-7/8"): With EB 1214L/ EB 1220BL/ EB 1222HL

Equipped

EB 1220BL � � � � � � � Approx. -/50 min.

WH 12DAF

113(1000 in-lbs., 1173 kgf�cm)

0 --- 2,400

0 --- 3,000

165 (6-1/2")

Equipped

Driver chuck

DC magnet

12

1.7

12

DW9071

DW9107

45 min.

7.2 --- 14.4

Plastic case Charger

29 (1-9/64")

1.7 (3.7 lbs.)

233 (9-11/64")

Equipped

P

*4

1.5 (3.3 lbs.): With EB 1212S

217 (8-1/2"): With EB 1212S

*5

EB 1222HL � � � � � � Approx. -/55 min.

*5

*1

--- 12 ---

EB 1220BL � � � � � Approx. 50 min.

M6 --- M14 (1/4" --- 9/16")

HITACHI

WR 12DAF2

MakerModelItem

CapacityOrdinary bolt

M6 --- M12 (1/4" --- 15/32")High-strength bolt

130(1150 in-lbs., 1330 kgf�cm)Max. tightening torque N�m

0 --- 2,500No-load rotation speed /min

0 --- 2,900Impact rate /min

Main body weight kg

Overall length mm 181 (7-1/8")

Center height mm

Equipped

PlungerTool tip mounting system

Switch

DC magnetType of motor

12Voltage

1.4/2.0/2.6

12

Bat

tery

V

Type EB 1212S/EB 1214L/

EB 1220BL/EB 1226HL

Nominal capacity Ah

UC 14YFA/UC 18YG

Nominal voltage V

EB 1226HL � � � � � � Approx. 60/- min.

Model

min.

7.2 --- 14.4/7.2 --- 18Recharging voltage V


(UC 14YFA/UC 18YG)

Standard accessories

Cha

rger

*1

*2

Overall height mm

26.5 (1-3/64")

1.7 (3.7 lbs.): With EB 1220BL/ EB 1226HL

1.6 (3.5 lbs.): With EB 1214S

226 (8-7/8"): With EB 1220BL/ EB 1226HL

217 (8-1/2"): With EB 1214S

Variable speed

Electric brake Equipped

Charging time EB 1214S � � � Approx. 30 min.

*1: Max. tightening torque is based on tightening an M12 (15/32") bolt (strength grade: 12.9) for 3 sec. with a hexagon socket.*2: Main body weight does not include accessory tools (hexagon socket etc.).*3: This type of battery could not be charged by the Model UC 18YG.*4: This type of battery could not be charged by the Model UC 12SD.

M6 --- M14 (1/4" --- 9/16")

M6 --- M10 (1/4" --- 3/8")

110(975 in-lbs., 1020 kgf�cm)

0 --- 2,200

0 --- 2,900

181 (7-1/8")

Equipped

Plunger

DC magnet

12

1.2/1.4/2.0/2.6

12

EB 1214S/EB 1220BL/

EB 1226HL

UC 12SD/UC 14YFA

EB 1212S, EB 1214L � � � � � Approx. 60/40 min.

12/7.2 --- 14.4


(UC 12SD/UC 14YFA)

26 (1-1/64")

1.6 (3.5 lbs.): With EB 1214L/ EB 1220BL/ EB 1226HL

226 (8-7/8"): With EB 1214L/ EB 1220BL/ EB 1226HL

Equipped

EB 1220BL � � � � � � � Approx. -/50 min.

WR 12DAF

160(1400 in-lbs., 1633 kgf�cm)

0 --- 2,400

0 --- 3,000

168 (6-39/64")

Equipped

Plunger

DC magnet

12

1.7

12

DW9071

DW9107

45 min.

7.2 --- 14.4


29 (1-9/64")

1.75 (3.9 lbs.)

233 (9-11/64")

Equipped

P

*3

1.5 (3.3 lbs.): With EB 1212S

217 (8-1/2"): With EB 1212S

*4

EB 1226HL � � � � � � Approx. -/60 min.

*4

7-1-2. Cordless impact wrench

12.7 mm (1/2")square drive

Tip condition 12.7 mm (1/2")square drive

12.7 mm (1/2")square drive

--- 13 ---

Strength grade 12.9 (high-strength bolt)

Strength grade 8.8(high-strength bolt)

Strength grade 6.8(ordinary bolt)

Strength grade 4.8(ordinary bolt)

00

5(3/16")

6(1/4")

8(5/16")

10(3/8")

12(15/32")

14(9/16")

mm

200(19.6 N ¥m, 14 ft-lbs.)

400(39.2 N ¥m, 29 ft-lbs.)

600(58.8 N ¥m, 43 ft-lbs.)

800(78.4 N ¥m, 58 ft-lbs.)

1000(98 N ¥m, 72 ft-lbs.)

1200(117.6 N ¥m, 86 ft-lbs.)

(kgf ¥cm)

Thread diameter

App

ropr

iate

tigh

teni

ng to

rque

7-2. Tightening Torque

7-2-1. Screw diameter and appropriate tightening torque

Generally speaking, the appropriate tightening torque for a screw can be determined by the strength grade of the

screw and the material tightened. Tables 1 and 2, and Fig. 4 below list data relative to the strength grade of

various screws and the appropriate tightening torque. For further reference, appropriate tightening torque is

calculated with the following formula. Study and use this formula for accurate selection of tightening torque.

T=k •d •p

T: Appropriate tightening torque (kgf•cm)

d: Nominal diameter for the screw (mm)

p: Recommended axial tightening force to be applied to the screw (kgf)

p=rated axial stress (kgf/cm2) x 0.8 x effective sectional area of the thread (mm2)

K: Torque coefficient (0.17)

Strength grade and rated axial stress of threads

Strength grade

Rated axial stress (kgf/mm2)

Material

Heat treatment

4.8 6.8 8.8 12.9

29.1 43.7 58.2 95

Mild steel Alloy steel including Ni, Mn, Cr, etc.

None Processed-hard material

Diameter and effective sectional areas of threads

Kind of thread (x pitch)

Effective sectional area ofthread (mm2)

M5 x 0.8 mm(3/16")

14.2

M6 x 1 mm(1/4")

20.1

M8 x 1.25 mm(5/16")

36.6

M10 x 1.5 mm(3/18")

58.0

M12 x 1.75 mm(15/32")

84.3

M14 x 2 mm(9/16")

115

Thread diameter and appropriate tightening torque

Fig. 4

Table 1

Table 2

--- 14 ---

7-2-2. Bolt tightening torque characteristics

Figure 2 shows relationships between time and tightening torque for individual bolt types and sizes. While the

data are useful for handy reference, actual tightening torque will vary depending on tightening conditions and

other variables. For details, please refer to Para. 8-3, Tightening Torque Variation.

NOTE: The term "tightening time" indicates the impact time after the lower surface of the bolt has come

in contact with the material into which it is being tightened.

In the tightening conditions shown in Figs. 5-1 and 5-2, the screws are being tightened directly

into a steel plate; accordingly, the torque goes up very abruptly in comparison with ordinary

bolt tightening conditions.

Model WH 12DAF2

Bolt

Nut

Ste

el p

late

thic

knes

s: t * The following bolts were utilized:

Ordinary bolt; strength grade 4.8High-strength bolt; strength grade

12.9

Strength grade is read as follows:4.8

Yield point or durable force:(45,500 psi)

Tensile strength of the bolt:(56,900 psi)

Washer

Washer

Fig. 5-1

Model WR 12DAF2

Fig. 5-2

Ordinary bolt

High tension bolt

15/32" x 1-3/4"(M12 x 45)

Tightening time: sec(Steel plate thickness: t = 63/64" (25 mm))

200(174)

400(347)

600(521)

800(694)

1000(868)

1200(1042)

kgf. cm(in-lbs.)

Tigh

teni

ng to

rque

00 1 2 3

20

40

60

80

120

100

0

N.m

Ordinary bolt

High tension bolt

5/16" x 1-3/6"(M8 x 30)


200(174)

400(347)

600(521)

800(694)

1000(868)

kgf. cm(in-lbs.)

Tigh

teni

ng to

rque

00 1 2 3

20

40

60

80

100

0

N.m

Ordinary bolt

High tension bolt

3/8" x 1-3/6"(M10 x 30)


200(174)

400(347)

600(521)

800(694)

1000(868)

kgf. cm(in-lbs.)

Tigh

teni

ng to

rque

00 1 2 3

20

40

60

80

100

0

N.m

Ordinary bolt

High tension bolt

3/8" x 1-3/6"(M10 x 30)


200(174)

400(347)

600(521)

800(694)

1000(868)

1200(1042)

00 1 2 3

20

40

60

80

120

100

0

N.m

Ordinary bolt

High tension bolt

5/16" x 1-3/6"(M8 x 30)


200(174)

400(347)

600(521)

800(694)

1000(868)

kgf. cm(in-lbs.)

Tigh

teni

ng to

rque

00 1 2 3

20

40

60

80

100

0

Ordinary bolt

High tension bolt

15/32" x 1-3/4"(M12 x 45)


200(174)

400(347)

600(521)

800(694)

1000(868)

1200(1042)

00 1 2 3

20

40

60

80

120

100

0

Tigh

teni

ng to

rque

Tigh

teni

ng to

rque

1400(1215)kgf. cm

(in-lbs.)

N.m

N.mkgf. cm(in-lbs.)

140

--- 15 ---

7-3. Number of Screws or Bolts Driven

7-3-1. Per-charge working capacity comparisons

Test data on the number of screws which can be driven per battery charge by the new model vs. the previous

models are shown in the table below. Please note that the data below are intended for general reference only as

the number of screws which can be tightened per charge will vary slightly depending on screw tightening

conditions, screw sizes, ambient temperatures and the charging capacity of the battery.

(1) Number of screws or bolts driven

Battery (Nominal capacity)

Tightening conditionModel HITACHI

WH 12DAF

EB 1214L(1.4 Ah)

Wood screw 4.0 mm dia. x 50 mm(soft wood)

230

Wood screw 4.2 mm dia. x 75 mm(hard wood) 135

Wood screw 4.5 mm dia. x 90 mm(hard wood) 85

Machine screw(M8 x 16 mm)

730

HITACHIWH 12DAF2

EB 1214S(1.4 Ah)

190

110

70

500

P

DW9071(1.7 Ah)

265

155

100

810

--- 16 ---

8. PRECAUTIONS IN SALES PROMOTION

8-1. Safety Instructions

In the interest of promoting the safest and most efficient use of these tools by all our customers, it is very

important that at the time of sale the salesperson carefully ensures that the buyer seriously recognizes the

importance of the contents of the Handling Instructions, and fully understands the meaning of the precautions

listed on the Caution Plate and Name Plate attached to each tool.

A. Handling Instructions

Salespersons must be thoroughly familiar with the contents of the Handling Instructions in order to give pertinent

advice to the customer. In particular, they must have a thorough understanding of the precautions in the use of

the cordless (battery charger type) electric power tools which are different from those of ordinary electric power

tools.

(1) Before use, ensure that the unit is fully charged.

New units are not fully charged. Even if the units were fully charged at the factory, long periods without use,

such as during shipping, cause the storage battery to lose its charge. Customers must be instructed to fully

charge the unit prior to use.

(2) When charging storage batteries, use only the exclusive Model UC 14YFA or UC 18YG charger provided with

the tool. Because of the designed rapid-charging feature, use of other battery chargers is hazardous.

(3) Follow prescribed steps in using the charger.

First connect the storage battery to the charger, then plug the charger into an AC outlet (ensuring that the

voltage matches that indicated on the unit). If this order is reversed, the charger may not function properly.

(4) Ensure the power source voltage is the same as that indicated on the Name Plate of the charger. Use of any

other power source (DC outlet, fuel powered generator, etc.) will cause the charger to overheat and burn out.

(5) Do not use any voltage increasing equipment (transformer etc.) between the power source and the charger.

If the charger is used with voltage over and above that indicated on the unit, it will not function properly.

(6) Conduct battery charging at an ambient temperature range of 0 C --- 40 C (32 F --- 104 F).

Special temperature sensitive devices are employed in the charger to permit rapid charging. Ensure that

customers are instructed to use the charger at the indicated ambient temperature range. At temperatures

under 0 C (32 F), the thermostat will not function properly, and the storage battery may be over-charged.

At temperatures over 40 C (104 F), the storage battery cannot be sufficiently charged. The optimum

temperature range is 20 C --- 25 C (68 F --- 77 F).

(7) The battery charger should not be used continuously.

At high ambient temperatures, if over three storage batteries are charged in succession, the temperature of

the coils on the transformer will rise and there is a chance that the temperature fuse inserted in the interior of

the transformer will inadvertently melt. After charging one battery, please charge the next battery after about a

fifteen-minute interval.

(8) The charger case is equipped with air vents to protect the internal electronic components from overheating.

Caution the customer not to allow foreign materials, such as metallic or flammable objects, to be dropped or

inserted into the air vents. This could cause electrical shock, fire or other serious hazards.

--- 17 ---

CAUTION Read thoroughly HANDLING INSTRUCTIONS before use.

(9) Do not attempt to disassemble the storage battery or the charger.

Special devices, such as a thermostat, are built into the storage battery and charger to permit rapid charging.

Incorrect parts replacement and/or wiring will cause malfunctions which could result in fire or other hazards.

Instruct the customer to bring these units to an authorized service center in the event repair or replacement is

necessary.

(10) Disposal of the Type EB 1214S, EB 1220BL or EB 1226HL storage battery

Ensure that all customers understand that Type EB 1214S, EB 1220BL or EB 1226HL storage batteries should

be turned in to any Hitachi power tool sales outlet or authorized service center when they are no longer

capable of being recharged or repaired. If thrown into a fire, the batteries may explode, or if discarded

indiscriminately, leakage of the cadmium compound contained in the battery may cause environmental

pollution.

B. Caution Plates

(1) The following precautions are listed on the Name Plate or Caution Plate attached to the main body of each

tool.

For Asia and Oceania

Warning To reduce the risk of injury, user must read and understand Instruction Manual.

AVERTISSEMENT Afin de réduire le risque de blessures, I'utilisateur doit lire et bien comprendre le mode d'emploi.

For the U.S.A. (excludes French) and Canada

CAUTION Read thoroughly HANDLING INSTRUCTIONS before use. Do not disassemble nor throw into fire.

(2) The following cautions are listed on the Name Plate attached to each Type EB 1214S, EB 1220BL or

EB 1226HL storage battery:

For Europe

CAUTION For safe operation, see Instruction Manual. Use HITACHI charger recommended in instruction manual for recharging.

For the U.S.A. and Canada

--- 18 ---

CAUTION For safe operation, see Instruction Manual. Charge HITACHI rechargeable batteries Type EB 7, EB 9, EB 12 and EB 14 series.Other types of batteries may burst causing personal injury and damage. Charge between 32 and 104ûF. Rest 15 minutes between the charging of batteries. Indoor use only. Replace defective cord immediately.

8-2. Tightening Torque Inspection Prior to Operation

As described and shown in Para. 7-2-2, the output tightening torque of which the Models WH 12DAF2 and

WR 12DAF2 are capable in excess of the rated tightening torque of certain bolts and screws. Accordingly, if the

tightening time is prolonged for such bolts and screws, it could cause damage to their threads or, in the worst

case, cause them to be sheared off. (This phenomenon is common to all existing impact drivers.) Particularly

when tightening M6 (1/4") or smaller screws, tightening time must be kept extremely short: 0.5 seconds or less.

The customer should be advised to carry out several screw tightening operations and adjust the tightening time as

necessary by measuring the tightening torque with an appropriate torque wrench or driver before commencing

continuous operation.

8-3. Tightening Torque Variation

The tightening torque of the cordless impact driver or wrench may vary slightly in accordance with the factors

described below. Salespersons are requested to advise the customer to confirm that appropriate tightening

torque is obtained by measuring the torque with an appropriate torque wrench or torque driver at the beginning of

the tightening operations, and as necessary during the tightening operations. In addition, the torque values

shown in Para. 7-2-1 above are useful as a handy reference, and may be utilized as tentative standards.

(1) Voltage of battery

Tightening torque is affected by the voltage output of the battery. For example, the relationship between

tghtening torque and the number of M12 x 45 mm (15/32" x 1-3/4") high-strength bolts tightened is shown in

figure below. As can be seen in the graph, the tightening torque decreases as the number of bolts tightened

increases. This phenomenon is caused by the decline in voltage output of the battery due to the increasing

number of bolts tightened. In particular, the tightening torque decreases rapidly just before the battery is fully

discharged (range "a" in the graph). As this phenomenon is an inherent drawback in any cordless impact

driver, salespersons are requested to ensure that the customer is fully aware of and understands this

characteristic.

CAUTION

(3) The following caution is listed on the Name Plate attached to the Model UC 14YFA or UC 18YG charger.

< UC 18YG >


For safe operation, see instruction manual. Charge HITACHI rechargeable battery types EB 7, EB 9, EB 12, EB 14 and EB 18series. Other types of batteries may burst causing personal injury and damage.

Charge between 32ûF and 104ûF. Rest 15 minutes between the charging of batteries. Indoor use only. Replace defective cord immediately.

< UC 14YFA >


--- 19 ---

1600(1389)

kgf .cm(in-lbs.)

1200(1048)

800(694)

400(347)

12

46

810

2

0

Tigh

teni

ng to

rque

Bat

tery

vol

tage

(2) Effects of low ambient temperatures

The tightening torque required may be reduced at low ambient temperatures or under the influence of grease

and different torque coefficients (dependent on manufacturing and finishing processes, and specified by bolt

manufacturers).

(3) Different bolt diameter

Differences in bolt diameter will cause variation of the required levels of tightening torque. Generally speaking,

tightening torque is higher for large bolts.

(4) Different materials being tightened

When a bolt is tightened into a soft material such as aluminum, plastic, wood, etc., the tightening torque is

considerably less than when the bolt is tightened into a hard material such as steel.

(5) Different tightening conditions

The tightening torque may vary in accordance with bolt torque coefficient (dependent on manufacturing

process specified by bolt manufactures), bolt grade and bolt length, even though the dimensions of the bolts

are the same. Tightening torque may also vary depending on the surface finishing state of tightening materials

(steel, aluminum, etc.), and materials to be tightened. In addition, if there is seal packing, clearance, etc.,

between tightening materials, the tightening torque is decreased.

(6) Wear and looseness of the socket

With extended use, the hexagonal portion of the socket which is fitted to the head of the bolt or drill bit, and/or

hexagonal portion of the driver chuck which is fitted onto the anvil in the main body will become worn and

loose. Wear and looseness will cause a proportionate loss of tightening torque.

In addition, use of an incorrect size socket (slightly larger than the bolt being tightened) will also result in

decreased torque.

(7) Bolt and nut rotate together

Tightening torque that can be achieved will be considerably decreased if the bolt and nut rotate together

during the tightening operation. The customer should be advised to carefully observe the operation and

ensure this does not occur.

Fig. 6

(WR 12DAF2)

Number of bolts driven per charge (When using EB 1214S battery)

--- 20 ---

8-4. Suggestions and Precautions for the Efficient Use of the Charger

(1) Batteries may not be rechargeable immediately after use

If the storage batteries are exposed to direct sunshine for an extended period, or if the temperature of the

battery is 40 ûC (104 ûF) or higher immediately after they have been used in the tool, the pilot lamp may not

light up when the batteries are connected to the Model UC 14YFA or UC 18YG charger. This is because the

built-in thermostat functions to stop the charging when the temperature of the storage batteries reach 40ûC

(104 ûF) or more. In such a case, the customer should be advised to place the batteries in a shaded area with

a good airflow, and allow sufficient cooling before recharging. This phenomenon is common to all existing

batteries which employ temperature sensitive overcharge devices. The cooling time required before charging

can be accomplished varies from a few minutes to about 30 minutes, depending on the load, duration of use,

and ambient temperature.

9. OTHER PRECAUTIONS

(1) Check for cracks or other damage on the socket

Cracks or any other faults on the socket are very hazardous. In addition, cracks or other damage to

accessories will cause loss of tightening torque efficiency. Advise the customer to inspect accessories often,

and ensure there are no abnormalities.

(2) Socket dimensions

Without fail, utilize an appropriate socket which matches the bolt and/or nut dimensions. If the socket

dimensions are larger than the bolts or nuts, it will not only cause insufficient tightening torque, but could also

easily cause damage to the socket. Please refer to the tables in Para. 6-2 for appropriate socket dimensions.

(3) Hammering section lubrication

Frequent or continuous use of the tool will cause excessive temperature rise of the hammering section,

resulting in depletion of the grease and subsequent increased wear of components which will, in turn, cause

loss of tightening efficiency. Accordingly, it is necessary to periodically replenish the grease in the hammering

section to ensure proper lubrication of moving and sliding components.

--- 21 ---

10. REPAIR GUIDE

WARNING: Without fail, remove the battery from the main body before starting repair or maintenance

work. Because the tool is cordless, if the battery is left in and the switch is activated

inadvertently, the motor will start rotating unexpectedly, which could cause serious injury.

10-1. Precautions in Disassembly and Reassembly

The [Bold] and <Bold> numbers correspond to the item numbers in the Parts List and the exploded assembly

diagram. ( [ ]: WH 12DAF2. < >: WR 12DAF2 )

10-1-1. Disassembly

(1) Removal of the Gear Box Ass'y [1] <1>

Remove the four Tapping Screws (W/Sp. Washer) D4 x 40 [6] <2> that connect the Hammer Case [7] <3>

with Housing (A).(B) Set [31] <28> . Remove the Hammer Case [7] <3>, the Inner Cover [23] <20> and the

Damper [24] <21> together from Housing (A).(B) Set [31] <28>. Remove the Retaining Ring [25] <22>. Then

the Gear Box Ass'y [1] <1> can be removed.

(2) Removal of the Hook Ass'y (W/Light) [36] <32>

Remove the Special Screw M5 [44] <40> with a flatblade screwdriver or a coin then remove the Hook Ass'y

(W/Light) [36] <32> and the Hook Spring [43] <39>.

(3) Removal of housing (B)

Remove the seven Tapping Screws (W/Flange) D4 x 20 (Black) [29] <26> from the main body to remove

housing (B).

(4) Remove the DC-Speed Control Switch [32] <30>, the Fin [42] <38> and the Motor [26] <23> together.

Remove the Pushing Button [33] <31> and the Strap (Black) [39] <35>.

(5) Disassembly of the switch ass'y

Disconnect the Internal Wire (Red) 115L [27] <24>, the Internal Wire (Black) 60L [28] <25> from the DC-

Speed Control Switch [32] <30> with a soldering iron. Remove the Machine Screw (W/Sp. Washer) M3 x 4

[41] <37> to remove the Fin [42] <38> from the FET of the DC-Speed Control Switch [32] <30>.

NOTE: Do not disconnect the three FET internal wires soldered to the DC-Speed Control Switch [32]

<30>.

(6) Removal of the Guide Sleeve [5] (Model WH 12DAF2 only)

By following the procedure shown in Figs. 7-1 to 7-4, you can remove the Retaining Ring [2], Washer (D) [3],

Guide Spring [4] and the Guide Sleeve [5] in this order. Be sure not to lose the Steel Ball D3.5 [8] in Anvil [9].

--- 22 ---

Anvil (B) [9]

Retaining Ring [2]

Washer (D) [3]

Guide Sleeve [5]Gap of retaining ring

1

Fig. 7-1

Hold the body and adjust gap of the retaining ring togroove of anvil (B), then insert a small flat-bladescrewdriver into the groove at an angle.

2

Fig. 7-2

Press down washer (D) with the screwdriver.

3

Fig. 7-3

Slide the screwdriver under one side of the gap ofthe retaining ring.

4

Fig. 7-4

Slowly raise the retaining ring using the end face ofthe guide sleeve as a fulcrum.

Then slowly raise the other side of the retaining ring with a screwdriver until it is free. The Guide Sleeve [5] can

now be removed. Avoid quickly raising the retaining ring or it may fly out forcefully.

The retaining ring can also be easily removed by widening the gap of the retaining ring with the jig for retaining

ring and slowly raising the retaining ring with a small flat-blade screwdriver.

(7) Disassembly of the hammer assembly

Hammer [11] <8>

Push down.Spindle (B) [17] <14>

Hammer Spring[14] <11>

Stopper [16] <13>

Washer (S) [15] <12>

J-297 Base for washer (S)

Fig. 8

Mount the hammer assembly onto

the J-297 base for washer (S).

With a hand press, push down the

top of Spindle (B) [17] <14> to

compress the Hammer Spring [14]

<11>. In this position, remove the

Stopper [16] <13> with a flat-blade

screwdriver, then release the hand

press. (See Fig. 8.)

Small flat-bladescrewdriver

--- 23 ---

Remove the hammer assembly from the J-297 base for washer (S) and support the end surface of Spindle (B)

[17] <14>. With a hand press, push down either of the raised faces of the Hammer [11] <8> to compress the

Hammer Spring [14] <11>. In this position, extract the two Steel Balls D5.556 [10] <7> from the cam grooves

of Spindle (B) [17] <14> and the Hammer [11] <8> with a small flat-blade screwdriver or a similar tool. Then,

slowly release the hand press and lift the Hammer [11] <8> and Washer (S) [15] <12> together to extract them

from Spindle (B) [17] <14>. The Hammer Spring [14] <11> can then be removed.

Steel ball guide groove

Spindle (B) [17] <14>

Hammer [11] <8>

Raised faces of hammer

Top of spindle cam

Steel Ball D5.556 [10] <7>

Fig. 9

10-1-2. Reassembly

Reassembly can be accomplished by following the disassembly procedures in reverse. However, special

attention should be given to the following items.

(1) Reassembly of housing (A) assembly

(a) Be sure to follow the wiring diagram (Fig. 10 ) for proper wiring.

(b) Pay attention to the polarity of the Motor [26] <23> when soldering the Internal Wire (Red) 115L [27] <24>

and Internal Wire (Black) 60L [28] <25> to the Motor [26] <23>. The red-marked side of the Motor [26]

<23> is positive.

(c) When mounting the Motor [26] <23> into housing (A), pay attention to the position of the Internal Wire

(Red) 115L [27] <24> and the depression for preventing motor body from rotating in housing (A).

NOTE: Make sure that the Internal Wire (Red) 115L [27] <24> is passed under the motor so that it is

not caught between the motor and housing (A).

(d) Mount the DC-Speed Control Switch [32] <30> to housing (A) so that the projection of the forwarding/

reversing lever at the top of the switch is inserted into the U-shaped groove of the Pushing Button [33]

<31>. Secure the Fin [42] <38> to the FET of the DC-Speed Control Switch [32] <30> with the Machine

Screw (W/Sp. Washer) M3 x 4 [41] <37>.

NOTE: Make sure that the three internal wires from the FET are passed above the DC-Speed

Control Switch [32] <30>. To avoid pinching, be careful not to place the internal wire of the

battery terminal on the terminal plate of the DC-Speed Control Switch [32] <30>.

--- 24 ---

Depression foranti-rotating

Internal Wire (Black) 60L[28] <25>

Internal Wire (Red) 115L [27] <24>

Red marking(Indicate positive side)

Internal Wire (Red) 115L [27] <24>Motor [26] <23>

Fin [42] <38>

Internal Wire (Black) 60L [28] <25>

Projection of theforwarding/reversing lever

FETMachine Screw (W/Sp. Washer)M3 x 4 [41] <37>

Fig. 10

DC-Speed Control Switch [32] <30>

--- 25 ---

(2) Reassembly of Housing (A).(B) Set [31] <28>

Mount the Strap (Black) [39] <35> and housing (B) to housing (A), and secure them with the seven Tapping

Screws (W/Flange) D4 x 20 (Black) [29] <26>.

(3) Reassembly of the mechanical parts

(a) Put Washer (S) [15] <12> onto the shaft of Spindle (B) [17] <14> and mount the Hammer [11] <8>

containing the twenty-eight Steel Balls D3 [12] <9>, Washer (J) [13] <10> and the Hammer Spring [14]

<11> to Spindle (B) [17] <14>.

(b) Align the top of the cam groove on Spindle (B) [17] <14> with the steel ball guide groove on the Hammer

[11] <8> as illustrated in Fig. 9. Press down either of the raised faces of the Hammer [11] <8> with a hand

press to compress the Hammer Spring [14] <11> until the end surface of the hammer contacts the flange of

Spindle (B) [17] <14> .

(c) Insert the two Steel Balls D5.556 [10] <7> into the steel ball guide groove. Check that the steel balls are

properly inserted in the cam groove. Then release the hand press.

(d) Mount the hammer assembly onto the J-297 base for washer (S). With a hand press, push down the top of

Spindle (B) [17] <14> to compress the Hammer Spring [14] <11>. On this condition, mount the Stopper

[16] <13> onto the spindle shaft and then release the hand press.

(e) Mount the Ring Gear [20] <17>, Washer (E) [21] <18>, Ball Bearing 6901VVCMPS2L [22] <19>, Inner

Cover [23] <20>, Damper [24] <21> and the Retaining Ring [25] <22> to the above reassembly.

Furthermore, mount the other mechanical parts and the Anvil [9] <6>, then the Hammer Case [7] <3>.

(4) Mounting the Gear Box Ass'y [1] <1> to the housing

Coat Housing (A).(B) Set [31] <28> with Silicon Rubber (THREEBOND 1211) as shown in Fig. 11. Mount the

Gear Box Ass'y [1] <1> so that the pinion press-fitted in the Motor [26] <23> properly meshes with the Idler

Gear Set [18] <15>. Check that the Anvil [9] <6> turns smoothly. If not, the gear meshes improperly. Check

the meshing condition. Tighten the four Tapping Screws (W/Sp. Washer) D4 x 40 [6] <2>. Wipe the silicon

rubber protruded from the housing with a cloth.

Fig. 11

Housing (A). (B) Set [31] <28>

Silicone rubber (Threebond 1211) coating area (hatching portion)

Housing (A). (B) Set [31] <28>

--- 26 ---

Push down.

Retaining Ring [2]

Washer (D) [3]

J-295 jig (B) for retaining ring

J-295 jig (A) for retaining ring

Fig. 12

(5) Reassembly of the Guide Sleeve [5] (Model WH 12DAF2 only)

Insert the Steel Ball D3.5 [8] into the hole of the Anvil [9]. Mount the Guide Sleeve [5], the Guide Spring [4]

and Washer (D) [3] in sequence. Mount the Retaining Ring [2] into the groove of the anvil using J-295 jigs (A)

and (B) for retaining ring as illustrated in Fig. 9.

(6) Reassembly of the Hook Ass'y (W/Light) [36] <32>

Check that the V-Lock Nut M5 [38] <34> is mounted to the Hook Ass'y (W/Light) [36] <32>. Then mount the

Hook Spring [43] <39> and secure it with the Special Screw M5 [44] <40>. (Mount the Hook Spring [43] <39>

with its larger-diameter side pointing toward the inside of the housing.)

(7) Check whether the direction of rotation of the Anvil [9] <6> coincides with the directional markings on the

push-on side of the Pushing Button [33] <31>. When the Pushing Button [33] <31> is turned to the (R) side,

the direction of rotation of the Anvil [9] <6> should be clockwise, as viewed from behind.

(8) Lubrication

(a) ATTOLUB MS No. 2

Cam groove and sliding section of Spindle (B) [17] <14>

Cam groove and projection of the Hammer [11] <8>

8 mm diameter hole and oil groove and upper surface of the claw of the Anvil [9] <6>

Sliding section between the Anvil [9] <6> and the metal

Two Steel Balls D5.556 [10] <7>

Pinion tooth flanks and front metal of the Motor [26] <23>

Tooth flanks of the Ring Gear [20] <17>

Twenty-eight Steel Balls D3 [12] <9>

Needle Roller [19] <16>

Tooth flanks and 5 mm diameter hole of the Idle Gear Set [18] <15>

(b) HITACHI MOTOR GREASE No. 29 (Model WH 12DAF2 only)

Steel Ball D3.5 [8]

Sliding section of the Anvil [9] and the Guide Sleeve [5]

--- 27 ---

(9) Screw tightening torque

Tapping Screw (W/Sp. Washer) D4 x 40 [6] <2> • • • • • • • • • • 1.96 0.49 N •m (20 5 kgf•cm, 17.4 4.3 in-lbs.)

Tapping Screw (W/Flange) D4 x 20 (Black) [29] <26> • • 1.96 0.49 N •m (20 5 kgf•cm, 17.4 4.3 in-lbs.)

Machine Screw (W/Sp. Washer) M3 x 4 [41] <37> • • • • • • 0.29 --- 0.39 N •m (3 --- 4 kgf•cm, 2.6 --- 3.5 in-lbs.)

Special Screw M5 [44] <40> • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1.96 0.49 N •m (20 5 kgf•cm, 17.4 4.3 in-lbs.)

10-2. Precautions in Disassembly and Reassembly of Battery Charger

Refer to the Technical Data and Service Manual for precautions in disassembly and reassembly of the Model

UC 14YFA or UC 18YG Battery Charger.

--- 28 ---

11. STANDARD REPAIR TIME (UNIT) SCHEDULES

For Model WH 12DAF2

MODEL 10 20 30 40 50 60 min.FixedVariable

WH 12DAF2Work Flow

Inner Cover

Damper

Motor

Hook Ass'y

Hammer Case

Anvil

Ring Gear

Housing(A).(B) Set

General Assembly

Hammer

Steel Ball

Hammer Spring

Spindle

Idle Gear Set

Needle Roller

Ball Bearing(6901VV)

Gear BoxAss'y

Guide Sleeve

DC-SpeedControl Switch

--- 29 ---

For Model WR 12DAF2

MODEL 10 20 30 40 50 60 min.FixedVariable

WR 12DAF2Work Flow

Inner Cover

Damper

Motor

Hook Ass'y

Hammer Case

Pin Retainer

Plunger

Anvil

Ring Gear

Housing(A).(B) Set

General Assembly

Hammer

Steel Ball

Hammer Spring

Spindle

Idle Gear Set

Needle Roller

Ball Bearing(6901VV)

Gear BoxAss'y

DC-SpeedControl Switch

ELECTRIC TOOL PARTS LIST

LIST NO. G836

CORDLESS IMPACT DRIVERModel WH 12DAF2

2005 • 8 • 10

(E1)

Hitachi Power Tools

503

504

505 506

1

23

45

6

7

89

1011

1213

14

15

1617

18

19

20

2122

23

24

25

26

2728

29

30

31

32

33

34

35

36

37

38

39

41

42

43

44

45

40

* ALTERNATIVE PARTS--- 2 ---

ITEMNO. CODE NO. DESCRIPTION REMARKS

NO.USED

PARTS

8 -- 05

WH 12DAF2

* 1 324-854 GEAR BOX (B) ASS’Y 1 INCLUD. 2-5, 7-25

* 1 323-939 GEAR BOX (B) ASS’Y 1 INCLUD. 2-5, 7-25 FOR TPE, CHN, SIN, KOR, HKG

2 315-984 RETAINING RING 1

3 315-983 WASHER (D) 1

4 320-409 GUIDE SPRING 1

5 323-954 GUIDE SLEEVE 1

6 992-630 TAPPING SCREW (W/SP. WASHER) D4X40 4

7 323-940 HAMMER CASE 1

8 319-535 STEEL BALL D3.5 (10 PCS.) 1

* 9 321-915 ANVIL (B) 1

* 9 321-884 ANVIL 1 FOR TPE, CHN, SIN, KOR, HKG

10 959-154 STEEL BALL D5.556 (10 PCS.) 2

11 323-949 HAMMER 1

12 321-934 STEEL BALL D3 (10 PCS.) 28

13 315-978 WASHER (J) 1

14 323-944 HAMMER SPRING 1

15 316-172 WASHER (S) 1

16 316-171 STOPPER 1

17 323-945 SPINDLE (B) 1

18 323-941 IDLE GEAR SET (2 PCS.) 2

19 323-942 NEEDLE ROLLER 2

20 323-946 RING GEAR 1

21 319-911 WASHER (E) 1

22 690-1VV BALL BEARING 6901VVCMPS2L 1

23 323-947 INNER COVER 1

24 321-894 DAMPER 1


26 323-948 MOTOR 1

27 321-876 INTERNAL WIRE (RED) 115L 1

28 321-877 INTERNAL WIRE (BLACK) 60L 1

29 302-086 TAPPING SCREW (W/FLANGE) D4X20 (BLACK) 7

30 NAME PLATE 1

31 324-855 HOUSING (A).(B) SET 1

32 321-917 DC-SPEED CONTROL SWITCH 1

33 321-871 PUSHING BUTTON 1

34 HITACHI LABEL 1

* 35 CAUTION PLATE (B) 1 FOR USA, CAN

36 321-918 HOOK ASS’Y (W/LIGHT) 1 INCLUD. 37, 38

37 321-672 TAPPING SCREW D2X6 2

38 320-288 V-LOCK NUT M5 1

39 306-952 STRAP (BLACK) 1

40 323-710 TERMINAL SUPPORT 1

41 320-777 MACHINE SCREW (W/SP. WASHER) M3X4 1

42 320-776 FIN 1

43 319-926 HOOK SPRING 1

44 319-927 SPECIAL SCREW M5 1

* 45 322-629 BATTERY EB 1214S (W/ENGLISH N.P.) 2

* 45 324-360 BATTERY EB 1214S (W/ENGLISH N.P.) 2 FOR USA, CAN

* 45 324-361 BATTERY EB 1214S (W/ENGLISH N.P.) 2 FOR TPE

* 45 320-387 BATTERY EB 1220BL (W/ENGLISH N.P.) 2

* 45 323-226 BATTERY EB 1226HL (W/ENGLISH N.P.) 2

* ALTERNATIVE PARTS --- 3 ---8 -- 05

STANDARD ACCESSORIES

OPTIONAL ACCESSORIES


NO.USED


NO.USED

WH 12DAF2

* 501 CHARGER (MODEL UC 18YG) 1

* 501 CHARGER (MODEL UC 14YFA) 1

* 502 TORCHLIGHT (MODEL UB 12D) 1 FOR GBR

* 503 987-575 CHUCK WRENCH FOR 10VLB-D, 10VLR-D 1 FOR AUS

* 504 321-811 DRILL CHUCK 10VLB-D 1 INCLUD. 503 FOR AUS

* 505 307-543 CHUCK ADAPTER 1 FOR AUS

* 506 324-359 CASE 1

* 506 322-611 CASE 1 FOR GBR

601 992-671 + DRIVER BIT (B) NO. 2 50L 1

602 992-672 + DRIVER BIT (B) NO. 3 50L 1

603 992-689 NON-MAGNETIC HEX. SOCKET 7MM 65L 1








611 996-197 HEX. SOCKET (LONG) 21MMX166L 1

612 321-823 DRILL CHUCK AND ADAPTER SET 1 INCLUD. 613, 614

613 987-575 CHUCK WRENCH FOR 10VLB-D, 10VLR-D 1

614 307-543 CHUCK ADAPTER 1

615 309-922 GREASE FOR IMPACT DRIVER (500G) 1

--- 4 ---


NO.USED

8 -- 05

WH 12DAF2

Printed in Japan

(050810N)

ELECTRIC TOOL PARTS LIST

LIST NO. G837

CORDLESS IMPACT WRENCHModel WR 12DAF2

2005 • 8 • 30

(E1)

Hitachi Power Tools

1

8

910

11

12

13

1415

16

17

1819

20

21

22

23

2425

26

27

28

30

31

29

32

33

34

35

37

38

39

40

36

7

2

3

4

56

501 502 503 504501

41



NO.USED

PARTS

8 -- 05

WR 12DAF2

1 324-856 GEAR BOX (C) ASS’Y 1 INCLUD. 3, 6-22

2 992-630 TAPPING SCREW (W/SP. WASHER) D4X40 4

3 324-857 HAMMER CASE 1

4 323-194 PIN RETAINER 1

5 323-193 PLUNGER 1

6 323-192 ANVIL (C) ASS’Y 1 INCLUD. 4, 5

7 959-154 STEEL BALL D5.556 (10 PCS.) 2

8 323-949 HAMMER 1

9 321-934 STEEL BALL D3 (10 PCS.) 28

10 315-978 WASHER (J) 1

11 323-944 HAMMER SPRING 1

12 316-172 WASHER (S) 1

13 316-171 STOPPER 1

14 323-945 SPINDLE (B) 1

15 323-941 IDLE GEAR SET (2 PCS.) 2

16 323-942 NEEDLE ROLLER 2

17 323-946 RING GEAR 1

18 319-911 WASHER (E) 1

19 690-1VV BALL BEARING 6901VVCMPS2L 1

20 323-947 INNER COVER 1

21 321-894 DAMPER 1


23 323-948 MOTOR 1

24 321-876 INTERNAL WIRE (RED) 115L 1

25 321-877 INTERNAL WIRE (BLACK) 60L 1

26 302-086 TAPPING SCREW (W/FLANGE) D4X20 (BLACK) 7

27 NAME PLATE 1

28 324-855 HOUSING (A).(B) SET 1

29 HITACHI LABEL 1

30 321-917 DC-SPEED CONTROL SWITCH 1

31 321-871 PUSHING BUTTON 1

32 321-918 HOOK ASS’Y (W/LIGHT) 1 INCLUD. 33, 34

33 321-672 TAPPING SCREW D2X6 2

34 320-288 V-LOCK NUT M5 1

35 306-952 STRAP (BLACK) 1

36 323-710 TERMINAL SUPPORT 1

37 320-777 MACHINE SCREW (W/SP. WASHER) M3X4 1

38 320-776 FIN 1

39 319-926 HOOK SPRING 1

40 319-927 SPECIAL SCREW M5 1

* 41 322-629 BATTERY EB 1214S (W/ENGLISH N.P.) 2

* 41 324-361 BATTERY EB 1214S (W/ENGLISH N.P.) 2 FOR TPE

* 41 320-387 BATTERY EB 1220BL (W/ENGLISH N.P.) 2

* 41 323-226 BATTERY EB 1226HL (W/ENGLISH N.P.) 2

* ALTERNATIVE PARTS --- 3 ---8 -- 05

STANDARD ACCESSORIES

OPTIONAL ACCESSORIES


NO.USED


NO.USED

WR 12DAF2

* 501 CHARGER (MODEL UC 18YG) 1

* 501 CHARGER (MODEL UC 14YFA) 1

* 502 TORCHLIGHT (MODEL UB 12D) 1 FOR GBR

* 503 322-752 BIT ADAPTER 1 FOR AUS, NZL

* 504 324-359 CASE 1

* 504 322-611 CASE 1 FOR GBR

601 CORNER ATTACHMENT ASS’Y 1 INCLUD. 602-618

602 955-300 HOUSING 1

603 955-301 METAL 3

604 955-302 SPINDLE 1

605 HITACHI LABEL 1

606 955-303 BEARING RACE 2

607 955-304 NEEDLE THRUST BEARING (NTA-1413) 2

608 955-305 COVER 1

609 955-306 NEEDLE BEARING (NTN BK1012) 1

610 948-227 RETAINING RING FOR D47 HOLE 1

611 955-307 PINION 1

612 955-308 SLEEVE 1

613 955-309 WASHER 1

614 955-310 SOCKET COVER 1

615 955-311 SOCKET 1

616 303-247 SEAL LOCK HEX. SOCKET HD. BOLT M5X25 6

617 873-537 SOCKET PIN 1

618 873-187 O-RING (J1SW1516) 1

619 991-481 FORM TIE SOCKET ASS’Y 11.3MMX95L 1 INCLUD. 617, 618

620 992-610 UNIVERSAL JOINT ASS’Y 1 INCLUD. 617, 618

621 955-153 UNIVERSAL JOINT PIN 1

622 991-476 BIT ADAPTER ASS’Y 1 INCLUD. 617, 618

623 944-291 HEX. SOCKET ASS’Y 10MMX40L 1 INCLUD. 617, 618








631 955-138 HEX. SOCKET ASS’Y (LONG) 12MMX52L 1 INCLUD. 617, 618



NO.USED

8 -- 05

WR 12DAF2OPTIONAL ACCESSORIES











642 986-058 HEX. SOCKET FOR PLASTIC CONE 12MMX70L 1 INCLUD. 617, 618

643 873-633 EXTENSION BAR ASS’Y (SQUARE) 12.7MMX100L 1 INCLUD. 617, 618

644 993-658 SOCKET ASS’Y FOR DUCT 12MMX95L 1 INCLUD. 617, 618

645 993-659 SOCKET FOR DUCT 12MMX52L 1

646 992-613 SOCKET ASS’Y FOR DUCT 13MMX95L 1 INCLUD. 617, 618, 647


648 992-615 SOCKET ASS’Y FOR DUCT 14MMX95L 1 INCLUD. 617, 618, 649


650 309-922 GREASE FOR IMPACT DRIVER (500G) 1

Printed in Japan

(050830N)

hitachi -...

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